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liraira [26]
3 years ago
9

Does the earth have an unlimited supply of magma?

Geography
1 answer:
Nat2105 [25]3 years ago
5 0

Answer:

No

Explanation:

The magma supply of the Earth is not unlimited, but instead it has a fairly constant volume. On the other hand, the magma is not spending itself even though it constantly comes out on the surface of the Earth. The reason for that is that the magma that comes out on the surface, is actually replaced by newly formed magma. The newly formed magma is actually from the crust of the tectonic plates that are subducting. As the plates are subducting, they reach the mantle layer where the temperature and pressure are very high, so they melt the crust. The molten crust is becoming the new magma that replaces the one that is pushed toward the surface. This is a cycle that constantly goes on, so even though the magma is not endless, it manages to circle through the top two layers and replenish itself.

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In the 1980s the northeast region of Brazil received almost no precipitation for how many years?
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Answer:

3 years

Explanation:

Even there was  a dry year in 1979, the area received almost the normal amount of rain in 1980.

In 1981 however, the year was quite dry, with rainfalls in drop of almost 20%, that began one of the most important drought in the history of Brazil.

In 1982, rainfalls were down by 30% and it got even worse.

In 1983, the rainfalls were down by about 35%, essentially destroying all the agriculture system that had been severely damaged by the two previous years.

In 1984, rain came back a bit higher than its traditional levels, and in 1985, the area was flooded by rain surpassing the average by 60%!

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Read about Africa's two greatest environmental concerns: desertification and the spread of disease. Choose one of these concerns
Advocard [28]

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Lack of water, and food, being in the vast desert means hard food and little rain this leads to many organisms struggling to live, also being forced to drink dirtier water means you could catch a disease more easily

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( Canada ) The Environment - Preservation
MariettaO [177]

Answer:

Explanation:

<em>1. Air pollution</em>

There are two types of air pollutants: primary and secondary. Primary pollutants are emitted directly from their source, while secondary pollutants are formed when primary pollutants react in the atmosphere.

The burning of fossil fuels for transportation and electricity produces both primary and secondary pollutants and is one of the largest sources of air pollution.

Vehicle exhaust contains hazardous gases and particulate matter, including hydrocarbons, nitrogen oxides, and carbon monoxide. These gases rise into the atmosphere and react with other atmospheric gases, creating even more toxic gases.

Heavy use of fertilizers in agriculture is a major source of fine particle air pollution, according to the Earth Institute, affecting much of Europe, Russia, China and the United States. The level of pollution caused by agricultural activities is believed to exceed all other sources of fine particle air pollution in these countries.

Ammonia is a major air pollutant from agricultural activities. Ammonia enters the air as a gas from concentrated animal waste and overfertilized fields.

This ammonia gas then combines with other pollutants such as nitrogen oxides and sulfates from vehicles and industrial processes to form aerosols. Aerosols are tiny particles that can penetrate deep into the lungs and cause heart and lung disease.

Other agricultural air pollutants include pesticides, herbicides and fungicides. All this also contributes to water pollution.

<em>2. Water pollution</em>

Nutrient pollution is caused by sewage, sewage and fertilizers. The high levels of nutrients in these springs enter water bodies and encourage the growth of algae and weeds, which can make the water undrinkable and deplete oxygen, leading to the death of aquatic life.

Pesticides and herbicides applied to crops and residential areas are concentrated in the soil and carried to the groundwater with rainwater and runoff. For these reasons, every time someone drills a well for water, it must be checked for contaminants.

Industrial waste is one of the main causes of water pollution as it creates primary and secondary pollutants including sulphur, lead and mercury, nitrates and phosphates, and oil spills.

In developing countries, about 70% of solid waste is dumped directly into the ocean or sea. This causes serious problems, including harming and killing sea creatures, which eventually affects people.

<em>3. Pollution of land and soil</em>

Land pollution is the destruction of land as a result of human activities and misuse of land resources. It occurs when people apply chemicals such as pesticides and herbicides to the soil, improperly dispose of waste, and recklessly exploit minerals in mining.

The soil is also polluted by leaking underground septic tanks, sewer systems, leaching of harmful substances from landfills, and direct discharge of sewage from industrial plants into rivers and oceans.

Rain and flooding can carry pollutants from other already polluted lands to soil elsewhere.

Over farming and overgrazing as a result of agricultural activities causes the soil to lose its nutritional value and structure, causing soil degradation, another type of soil pollution.

Landfills can leach harmful substances into soil and waterways and create very unpleasant odors and are breeding grounds for rodents that carry disease.

<em>4. Noise and light pollution</em>

Noise is considered an environmental pollutant caused by domestic sources, public events, commercial and industrial activities, and transportation.

Light pollution is caused by prolonged and excessive use of artificial lighting at night, which can cause health problems for humans and disrupt natural cycles, including wildlife activities. Sources of light pollution include electronic billboards, night sports venues, street and car lights, city parks, public places, airports, and residential areas.

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